यदि $\tan \frac{\theta}{2} = t$ है,तो $\frac{1 - t^2}{1 + t^2}$ किसके बराबर है?

  • A
    $\cos \theta$
  • B
    $\sin \theta$
  • C
    $\sec \theta$
  • D
    $\cos 2\theta$

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